linux-kernel - Re: [PATCH v2 1/2] pid: Replace pid bitmap implementation with IDR API

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Date:   Wed, 27 Sep 2017 17:15:42 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Gargi Sharma <gs051095@...il.com>
Cc:     Rik van Riel <riel@...riel.com>, linux-kernel@...r.kernel.org,
        Julia Lawall <julia.lawall@...6.fr>, akpm@...ux-foundation.org,
        mingo@...nel.org, pasha.tatashin@...cle.com, ktkhai@...tuozzo.com
Subject: Re: [PATCH v2 1/2] pid: Replace pid bitmap implementation with IDR
 API

On 09/27, Gargi Sharma wrote:
>
> >
> > And make this patch correct ;)
> >
> > because currently it is wrong, zap_pid_ns_processes() won't kill the pid
> > returned by the first idr_get_next().
> Yes, I missed this. I can simply remove the idr_get_next() before the
> idr_for_each_continue and that will take care of it.

Yes, and also remove the while(pid) loop as Rik suggests, just do

	read_lock(&tasklist_lock);
	nr = 2;
	idr_for_each_entry_continue(..., nr) {
		kill pid_task()
	}
	read_unlock(&tasklist_lock);

Oleg.